PHP remote file download class (supports resumable upload)

PHP remote file download class (supports resumable Upload), read PHP remote file download class (supports resumable Upload), 1. function: supports resumable download, can calculate the transfer rate, can control the transfer rate easy to use: $ object = newhttpdownload (); $ object-set_byfile ($ file) % N # H # %; // server file name, including Path $ object-fil

1. function: supports resumable download, computing the transfer rate, and controlling the transfer rate

Easy to use:

$ Object = new httpdownload ();
$ Object-> set_byfile ($ file) % N # H # %; // server file name, including Path
$ Object-> filename = $ filename; // download the file name saved
$ Object-> download ();

3. source file:

Class httpdownload {
Var $ data = null;
Var $ data_len = 0;
Var $ data_mod = 0;
Var $ data_type = 0;
Var $ data_section = 0; // section download
Var $ sentSize = 0;
Var $ handler = array ('auth' => null );
Var $ use_resume = true;
Var $ use_autoexit = false;
Var $ use_auth = false;
Var $ filename = null;
Var $ mime = null;
Var $ bufsize = 2048;
Var $ seek_start = 0;
Var $ seek_end =-1;
Var $ totalsizeref = 0;
Var $ bandwidth = 0;
Var $ speed = 0;
Function initialize (){
Global $ HTTP_SERVER_VARS;
If ($ this-> use_auth) // use authentication {
If (! $ This-> _ auth () // no authentication {
Header ('www-Authenticate: Basic realm = "Please enter your username and password "');
Header ('http/1.0 401 unauthorized ');
Header ('status: 401 unauthorized ');
If ($ this-> use_autoexit) exit ();
Return false;
}
}
If ($ this-> mime = null) $ this-> mime = "application/octet-stream"; // default mime
If (isset ($ _ SERVER ['http _ range']) | isset ($ HTTP_SERVER_VARS ['http _ range']) {
If (isset ($ HTTP_SERVER_VARS ['http _ range']) $ seek_range = substr ($ HTTP_SERVER_VARS ['http _ range'], strlen ('bytes = '));
Else $ seek_range = substr ($ _ SERVER ['http _ range'], strlen ('bytes = '));
$ Range = explode ('-', $ seek_range );
If ($ range [0]> 0 ){
$ This-> seek_start = intval ($ range [0]);
}
If ($ range [1]> 0) $ this-> seek_end = intval ($ range [1]);
Else $ this-> seek_end =-1;
If (! $ This-> use_resume ){
$ This-> seek_start = 0;
// Header ("HTTP/1.0 404 Bad Request ");
// Header ("Status: 400 Bad Request ");
// Exit;
// Return false;
} Else {
$ This-> data_section = 1;
}
} Else {
$ This-> seek_start = 0;
$ This-> seek_end =-1;
}
$ This-> sentSize = 0;
Return true;
}
Function header ($ size, $ seek_start = null, $ seek_end = null ){
Header ('content-type: '. $ this-> mime );
Header ('content-Disposition: attachment; filename = "'. $ this-> filename .'"');
Header ('last-Modified: '. date ('d, d m y h: I: s \ G \ M \ t', $ this-> data_mod ));
If ($ this-> data_section & $ this-> use_resume ){
Header ("HTTP/1.0 206 Partial Content ");
Header ("Status: 206 Partial Content ");
Header ('Accept-Ranges: bytes ');
Header ("Content-Range: bytes $ seek_start-$ seek_end/$ size ");
Header ("Content-Length:". ($ seek_end-$ seek_start + 1 ));
} Else {
Header ("Content-Length: $ size ");
}
}
Function download_ex ($ size ){
If (! $ This-> initialize () return false;
Ignore_user_abort (true );
// Use seek end here
If ($ this-> seek_start> ($ size-1) $ this-> seek_start = 0;
If ($ this-> seek_end <= 0) $ this-> seek_end = $ size-1;
$ This-> header ($ size, $ seek, $ this-> seek_end );
$ This-> data_mod = time ();
Return true;
}
Function download (){
If (! $ This-> initialize () return false;
Try {
Error_log ("begin download \ n", 3, "/usr/local/www/apache22/LOGS/apache22_php.err ");
$ Seek = $ this-> seek_start;
$ Speed = $ this-> speed;
$ Bufsize = $ this-> bufsize;
$ Packet = 1;
// Do some clean up
@ Ob_end_clean ();
$ Old_status = ignore_user_abort (true );
@ Set_time_limit (0 );
$ This-> bandwidth = 0;
$ Size = $ this-> data_len;
If ($ this-> data_type = 0) // download from a file {
$ Size = filesize ($ this-> data );
If ($ seek> ($ size-1) $ seek = 0;
If ($ this-> filename = null) $ this-> filename = basename ($ this-> data );
$ Res = fopen ($ this-> data, 'RB ');
If ($ seek) fseek ($ res, $ seek );
If ($ this-> seek_end <$ seek) $ this-> seek_end = $ size-1;
$ This-> header ($ size, $ seek, $ this-> seek_end); // always use the last seek
$ Size = $ this-> seek_end-$ seek + 1;
While (! (Connection_aborted () | connection_status () = 1) & $ size> 0 ){
If ($ size <$ bufsize ){
Echo fread ($ res, $ size );
$ This-> bandwidth + = $ size;
$ This-> sentSize + = $ size;
} Else {
Echo fread ($ res, $ bufsize );
$ This-> bandwidth + = $ bufsize;
$ This-> sentSize + = $ bufsize;
}
$ Size-= $ bufsize;
Flush ();
If ($ speed> 0 & ($ this-> bandwidth> $ speed * $ packet * 1024 )){
Sleep (1 );
$ Packet ++;
}
}
Fclose ($ res );
}
Elseif ($ this-> data_type = 1) // download from a string
{
If ($ seek> ($ size-1) $ seek = 0;
If ($ this-> seek_end <$ seek) $ this-> seek_end = $ this-> data_len-1;
$ This-> data = substr ($ this-> data, $ seek, $ this-> seek_end-$ seek + 1 );
If ($ this-> filename = null) $ this-> filename = time ();
$ Size = strlen ($ this-> data );
$ This-> header ($ this-> data_len, $ seek, $ this-> seek_end );
While (! Connection_aborted () & $ size> 0 ){
If ($ size <$ bufsize ){
$ This-> bandwidth + = $ size;
$ This-> sentSize + = $ size;
} Else {
$ This-> bandwidth + = $ bufsize;
$ This-> sentSize + = $ bufsize;
}
Echo substr ($ this-> data, 0, $ bufsize );
$ This-> data = substr ($ this-> data, $ bufsize );
$ Size-= $ bufsize;
Flush ();
If ($ speed> 0 & ($ this-> bandwidth> $ speed * $ packet * 1024 )){
Sleep (1 );
$ Packet ++;
}
}
} Else if ($ this-> data_type = 2 ){
// Just send a redirect header
Header ('Location: '. $ this-> data );
}
If ($ this-> totalsizeref = $ this-> sentSize) error_log ("end download \ n", 3, "/usr/local/www/apache22/LOGS/apache22_php.err ");
Else error_log ("download is canceled \ n", 3, "/usr/local/www/apache22/LOGS/apache22_php.err ");
If ($ this-> use_autoexit) exit ();
// Restore old status
Ignore_user_abort ($ old_status );
Set_time_limit (ini_get ("max_execution_time "));
}
Catch (Exception $ e ){
Error_log ("cancel download \ n". $ e, 3, "/usr/local/www/apache22/LOGS/apache22_php.err ");
}
Return true;
}
Function set_byfile ($ dir ){
If (is_readable ($ dir) & is_file ($ dir )){
$ This-> data_len = 0;
$ This-> data = $ dir;
$ This-> data_type = 0;
$ This-> data_mod = filemtime ($ dir );
$ This-> totalsizeref = filesize ($ dir );
Return true;
} Else return false;
}
Function set_bydata ($ data ){
If ($ data = '') return false;
$ This-> data = $ data;
$ This-> data_len = strlen ($ data );
$ This-> data_type = 1;
$ This-> data_mod = time ();
Return true;
}
Function set_byurl ($ data ){
$ This-> data = $ data;
$ This-> data_len = 0;
$ This-> data_type = 2;
Return true;
}
Function set_lastmodtime ($ time ){
$ Time = intval ($ time );
If ($ time <= 0) $ time = time ();
$ This-> data_mod = $ time;
}
Function _ auth (){
If (! Isset ($ _ SERVER ['php _ AUTH_USER ']) return false;
If (isset ($ this-> handler ['auth']) & function_exists ($ this-> handler ['auth']) {
Return $ this-> handler ['auth'] ('auth', $ _ SERVER ['php _ AUTH_USER '], $ _ SERVER ['php _ AUTH_PW']);
} Else return true; // you must use a handler
}
}
?>